Reaming-drill.



H. R. HUGHES.

REAIVIING DRILL.

APPLICATION FILED FEB. 24. I9l4.

l, 174,575. Patented M211. 7, 1916.

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E l 4 rif-20M@ H. R. HUGHES.

REAMING DRILL.

APPLICATION HLED FEB. 24. 1914.

1,1?49575, l Patented Mar. 7, 1916.

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-I To all whom 'it may concern:

' clear, and exactV description,

UMTED STATESPATENT (n311-ICLEI i HOWARD n. HUGHES, or HoUs'roN, TEXAS, AssIGNon r,ro SHARP-HUGHES mooi.

COMPANY,I OF HOUSTON, TEXAS, A CORPORATION 0F TEXAS.

-v Emme-DRILL. ,Y

Be it known that L HoWARD R. HUGHns,

a.A citizen of the United States, residing at` Houston, Texas, have 'invented a certain new and useful Improvement in Reaming- Drills, of which such as will enable others skilled in the art to which it appertains to make and use`y the same.

This invention relates to rotary boring. drills of the type that are rotatable cutters.

provided with The portions of the cutters on rotary drills which are subjected to the greatest wear are the portions of the cutters which acton the outer edge of the bottom of the hole adjacent the (side walll of the hole.

' When these portions of the cutters wear the gage substantially 'And still another Objct away the drill loses its clearance; or, in other words, fails to make a hole of the required diameter. ream -out the hole or increase the diameter of same so as to bring the hole back to gage.

The main object of my invention is'to provide a rotary cutter boring drill which comprises means separate and distinct from the main cutters of the drill for maintaining theelearance of the drill headso as to prevent the diameter of the hole. from` be coming gradually less or .diminishing when'y away,`said ,meansbeing permanently combined with thel drill.-r

as essential a part of the main' cutters wear head so that itforms the drill as the cutters'thereof.

Another object is to provide a rotatably mounted v ting rollers mounted in the head ata point labove said vfrusto-onical-Shaped cutters-.and

arranged in such a manner that they fact i on the side 'wall of the, hole'and thus vmaintain of the holegas'w'ellias tend-'tofpiel head froi'nwabbling inthei is ing drill of the constr ctioujustldese which isso designe' vent the "suflcientelearane rlthat is ipiifmped' out. H ,A Figure 1' ofthe"drawings is a side elevathe following is a full,

It is then necessary toy rotaryboring drill that comprises a head which is" adapted to,` be connected to av drill stem, frusto-conical-shaped cutters ion said head, .and cuthole.' f @.to'prov' def hors;

Patented Mar. '7, 1916.

tional view of a rotary 4cutter drill constructed in accordance with my i vention;

Fig. 2 is a horizontal sectional-'v ew taken `on the line 2-2 of Fig. l; Fig. 3 is-l a side elevational view of one-half of the head of the drill, partly broken away to more clearly illustrate the mounting of one of the reaming rollers on the head; Figs. 4, 5 -V ,and 6 yare detail views illustrating various types of cutting. surfaces that the reaming rollers can be provided with; Fig. 7 is a side elevational viewv illustrating a modification of my invention; Fig. 8 is a. detail horizontal sectional view taken on the line 8 8 of Fig. 7; and Fig. 9 is a top plan view of the drill shown in Fig. 4.

Brieiiy described,` my improved drillfconsists of ahead provided with rotatable cutters that constitute the main cutting means of the drill and one or more reaming rollers permanently combined with the head and arranged above the main cutters for' acting on the side of the hole so as to maintain suiicientvclearance for the drill even after the main cutters have become worn to such an extent that lthey fail to form a hole of the required diameter. I have herein illustrated my invention embodied in a standard type-of drill that isr now ingeneral use and 'which comprises a two-part head, each part ofwhichhas mounted thereon an approximatelyjfrusto-conical-shaped cutter but I do not wish it to be understood that my v'invention is limited vto a rotary boring drill lof the particular type mentioned as my broad idea lconsists in a rotary cutter drill which comprises as a permanent or integral part thereof.a.'-means separate and distinct 2 which secures the drill to the drill stem or tubular-shaped operating member 3 through which water-'is introduced intothe 'fliole so .as toj-ush out the disintegrated `material. asiibstantially frusto-conical-shaped cutter Bris rotatably mounted on each section A of the-head, the axis of rotation of each of said' cutters being inclined downwardly and inwardly toward the longitudinal center or aXis of the head. Reaming rollers C are mounted in the head at points above the cutters B so as to act on the side wall of the -hole and thus maintain the gage of the hole after the cutters B have become worn to such a degree that they fail to make a hole of the requireddiameter or a hole large enough to provide sufficient clearance for the drill. The reaming rollers C revolve about vertical axes, and they are set in the lead in such a manner that they project slightly beyond the side of the head, as shown in Fig. 2. In the embodiment of my invention shown in Figs. 1 to 3, each section A of the drill head is provided witha reaming roller C that forms a permanent or integral part of said section. The sections A are provided with horizontally-disposed grooves or pockets for receiving the reaming rollers C, and said rollers are rotatably mounted on vertically-disposed spindles or shafts 4 which can be connected to the head in any suitable way, the spindles 4 of the drill herein shown being screwed into the top walls of the pockets that receive the reaming rollers, as shown in Figs. 1 and 3, the bottom walls of said pockets being provided with openings in which the lower end portions of said spindles are seated and up through which the spindles are screwed into the top walls of said pockets. One side of each of the sections A of the head is cut aw'ay or provided with a lflat` face 5, as shown more clearly in Fig. 2, so as to provide passageways for the flushing water, and the reaming rollers are arranged at opposite sides of the head. as shown in Fig. 2, so that a passageway will be provided at each side of the head up through which the disintegrated-material and flushing water can escape. The spindles 4; are preferably provided with bushings 6 on which the rollers turn, and washers 7 are set in recesses formed in the top and bottom faces of the reaming rollers so as to provide eflicient bearing surfaces for the rollers, and the head is provided with branch lubricating ducts 8 that lead from'the main lubricating ducts 9 in the head to lubricating ducts 10 formed in the spindles 4 and in the bushin s 6, as shown in Fig. 3, so as to keep the earing surfaces for the reaming rollers thoroughly lubricated.

The reaming rollers can be provided with any suitable type of cutting surface, either a spiral groove 11, as shown in Fig. 4, inclined chisel-teeth 11a, as shown in Fig. 5,

yor straight vertically-disposed chisel-teeth 11". as shown in Fig. 6.

W'lien the drill is in operation, the reaming rollers-'C act on the side wall of the hole and shear off any material which the main cutters B have failed to remove from the side wall of the hole, thus keeping the gage wabblingin the hole as they bear against the side wall of the hole at points intermediate the points where the main cutters B engage the side wall of the hole. The usual water-courses 12 are `formed in the head for the flushing water that is pumped down into the hole so as to -displace the disintegrated material, and the cut-away portions' at the sides of the hole provide suficient space be` tween the head and the side wall of the hole to permit the disintegrated material and the flushing water'to travel upwardly and past the head, thus preventing the disintegrated material from packing in the hole.

While I prefer toconstruct the drill in the manner previously described, I do not wish it to be understood that my invention is limited to a drill in which the reaming rollers are located inthe head in the position illustrated in Fig. 2 and mounted in the manner previously described, for, if desired, the reaming rollers could be located at the dividing line between the two sections A of the head, as shown in Figs. 7 and 9.

In the drill shown in Figs. 7 to 9, inclusive, eachD of the reaming rollersV C is rogrooves formed in the meeting faces of the two sections-A of the head, said spindle being provided with a cross-pin 13 that is also seated in coperating recesses or grooves formed in the meeting faces of the sections of the headso' as to prevent the spindle from turning or rotating with relation to the head. Cut-out portions 5a are formed in the head on each side of the reaming rollers, as shown in Fig. 9, so as to provide suficient clearance between the head and the side wall of the hole for the' disintegrated material that is flushed out of thev hole by the wash-water.

While the chief object of my invention is to improve and increase the efficiency of the standard Sharp-Hughes rotary drill bit which is now in general use, still my broad idea is applicable to any type of drill or drill bit which loses its clearance when the cutters of same-become worn, and therefore I wish it to be understood that my invenl claim as new and desire to secure by Letters Patent is:

l. A; rotary boring drill, comprising a longitudinally-divided head composed of two members, each of which forms one-half of the head, a cutting means on said head, a horizontally-disposed roller permanently mounted in each of said members at a point above said cutting means, said rollers being positioned diametrically opposite each other and arranged in pockets that are produced by forming horizontal notches in said members, a vertically-disposed spindle for each of said rollers whose end portions are arranged in openings in the top and bottom walls of the pocket, and water passageways in the outer -surfaces of the head that extend longitudinally of same adjacent said rollers.

2. A rotary boring drill comprising a longitudinally divided head composed of l two members, each of which forms 'one half by forming horizontal notches in said mem bers, a vertically-disposed spindle for each of said rollers that projects upwardly through a hole in the botto-m of the roller pocket and is screwed into the top wall of said pocket, and Water passageways in the outer surface of the head that extend longitudinally of same adjacent said rollers.

ln testimony whereof I hereunto affix my signature in the presence of two witnesses, this 16 day of February 1914,

HOWARD R. HUGHES.

Witnesses:

L. A. GoDBoLD, C. E. REED. 

